Bluetooth Chip: JL7003D Bluetooth Version: V5.3 Operation Distance: 10M Speaker: φ13,22Ω Frequency: 20Hz-20KHz Capacity: 135mAh with protection PCB Talking Time: 5 Hours at 80% Volume Music Time: 9 Hours at 80% Volume Charging Time: 1.5 Hours Standby Time: 30 Hours Bluetooth Profile: HFP/A2DP/AVRCP